Processing of ZrO2 scaffolds coated by glass-ceramic derived from 45S5 bioglass

FRANCO MATÍAS STÁBILE; MARÍA PATRICIA ALBANO; LILIANA BEATRÍZ GARRIDO; CRISTINA VOLZONE; PAULO TAMBASCO DE OLIVEIRA; ADALBERTO LUIZ ROSA

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 42 p. 4507 - 4516

0272-8842

Three dimensional,highly porous,ZrO2 scaffolds coated by glass?ceramic derived from 45S5 bioglass were fabricated.The surface reactivityof 45S5 in aqueous solution was investigated as a function of the immersion time.The influence of the solid loading on the rheological behaviorof 45S5 aqueous slips with ammonium polyacrylate(NH4PA) was studied;besides the effect of poly(vinyl)alcohol(PVA)on the relativeviscosity was determined.The structure and microstructure of uncoated and coatedZrO2 scaffolds were characterized.The high ionic exchangecapability of 45S5 wasdemonstrated bythe pH rise,the significant weight loss and the amorphous calciumphosphate nucleation,upon itsimmersion in aqueous solution.The addition of PVA did not affect the dispersion properties of the 45S5 powder,which wer ebasically controlledby its negative surface charge.30wt% 45S5 slips with 4wt% PVA exhibited a yield stress and an adequate viscosity in the low shear rate range,to produce a bioglass coating into the ZrO2 scaffold. The glass-ceramic coating was distributed along the strut surfaces,forming a thin filmwithout altering the porosity and the strut thickness of the original ZrO2 scaffold structure.